Anchorage, AK Environmental Rules: Defensible Space (2026)
Key Facts
- Applies to
- lots with 20%+ average slope
- Envelope sizes
- 10,000 to 40,000 sq ft by lot size
- Fire exception
- clearing to "modify fuels" allowed
- Base civil fine
- $300 per violation, AMC 21.14.040
- Noncompliance fine
- up to $250 per day, AMC 21.14.050
- WUI permit surcharge
- 0.002 x valuation, min $75
Summary
Anchorage does not mandate a defensible-space clearing zone around homes, but its steep-slope development standard lets hillside owners exceed the normal site disturbance envelope specifically "to modify fuels in order to reduce fire risk," permitting vegetation thinning beyond the building envelope on lots graded 20 percent or steeper.
There shall be a site disturbance envelope on each applicable lot. Earth disturbance and vegetation clearing shall be limited to the site disturbance envelope. Clearing, grubbing, or grading outside the site disturbance envelope is prohibited except to modify fuels in order to reduce fire risk, or to accommodate utility service connections. ... "Modify fuels." Reduce the amount of non-fire-resistant vegetation or alter the type of vegetation to reduce the fire risk.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 5010260; v11 updated 2026-09-01).
Full Breakdown
a. Ordinary development on those lots is confined to a site disturbance envelope sized by lot area: 10,000 square feet or 50 percent of the lot, whichever is less, on lots under 40,000 square feet; 20,000 square feet on lots up to two acres; 30,000 square feet on lots up to five acres; and 40,000 square feet on lots five acres or larger. 15 defines "modify fuels" as work to "reduce the amount of non-fire-resistant vegetation or alter the type of vegetation to reduce the fire risk," which is the closest thing Anchorage's code has to a defensible-space allowance for its hillside neighborhoods.
Those same hillsides can fall inside a municipality-designated "wildfire danger area," mapped under the Anchorage Fire Exposure Model the Anchorage Fire Department maintains, where the fire chief can close land to public use during a burn ban. 002 times project valuation, minimum $75, specifically for wildland-urban interface construction.
Violations & Fines
Clearing, grubbing, or grading outside the site disturbance envelope for any reason other than fuel modification or a utility connection is a Title 21 zoning violation. AMC 21.14.040 makes it punishable by a civil penalty under AMC 14.60.030, or a $300 civil fine per violation if no fine is set there, and AMC 21.14.050 lets the director assess up to $250 per day for failing to comply with a final enforcement order, on top of stop-work authority.
Frequently Asked Questions
Can I clear brush around my house on Anchorage's Hillside to reduce wildfire risk?
Does Anchorage require homeowners to maintain a defensible space around structures?
What is a site disturbance envelope on an Anchorage hillside lot?
Sources & Official References
Other rules in Anchorage
Compare Anchorage to another location·View the Alaska environmental rules overview
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